Abstract
We present the evaluation of four Eco-friendly corrosion inhibitors for the corrosion mitigation of mild steel in acid media. The corrosion inhibition of mild steel by ethanol extracts from Viscum album (EEVA) and some of its isolated phytochemical components; phytates extract (PEVA), saponins extract (SEVA), and flavonoids extracts (FEVA) have been studied using gravi-metric and gasometric techniques. The results of the study reveal that these ecofriendly and benign extracts function as good inhibitors for mild steel corrosion in sulphuric acid. Inhibition efficiency of the extracts increases with inhibitor concentration and temperature rise. The trend of inhibition efficiency in lower inhibitor concentration is EEVA > PEVA > SEVA > FEVA and at higher concentration, the order was SEVA > PEVA > EEVA > FEVA. The presence of the plant extracts decreases the corrosion activation energy in the solution which indicates chemical adsorption mechanism. The adsorption of the components of the extracts is consistent with Temkin isotherm. The interaction between the isolated extracts is synergistic at lower inhibitor concentration and antagonistic at higher concentrations. The Kads values for PEVA and SEVA are higher than those of EEVA and FEVA. This implies that PEVA and SEVA are more efficiently adsorbed on the mild steel surface.
Highlights
We present the evaluation of four Eco-friendly corrosion inhibitors for the corrosion mitigation of mild steel in acid media
The Kads values for phytates extracts of Viscum album (PEVA) and saponins extracts of Viscum album (SEVA) are higher than those of ethanol extracts from Viscum album (EEVA) and flavonoids extract of Viscum album (FEVA). This implies that PEVA and SEVA are more efficiently adsorbed on the mild steel surface
The results showed that Ea value in the presence of EEVA, PEVA, FEVA and SEVA is lower compared to the blank system
Summary
The extracts from the leaves stimulate insulin secretion from pancreas cells and help in the treatment of arthritis [14] [15] [16] [17] [18] This medicinal plant is believed to be rich in nitrogen, sulphuric and oxygen containing organic compounds could exhibit a very strong inhibitive effect on corrosion of steel. This work presents results of experiments designed to investigate the corrosion inhibition performance of the isolated phytochemicals in Viscum album leaves on mild steel corrosion in H2SO4 solutions using gasometric and weight loss techniques This is in order to ascertain the major active component responsible for the corrosion inhibition and to gain more understanding of the synergistic/antagonistic relationships between the extracts. For the purpose of this study, the phytochemicals that were isolated are phythates, saponins and flavonoids
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